Mk Playwright CLI

Browser Automation with playwright-cli

Use playwright-cli when: DOM interaction, navigation, data extraction, or generating reusable .spec.ts E2E test code. Use mk:agent-browser instead when: session persistence (auth flows, MFA, cookie import) is required.

Quick Start

playwright-cli open https://playwright.dev
playwright-cli snapshot                  # Get element refs (e1, e2, ...)
playwright-cli click e15
playwright-cli type "page.click"
playwright-cli press Enter
playwright-cli screenshot
playwright-cli close

Core Workflow

1. open <url> — navigate to page
2. snapshot — get accessibility tree with element refs (e1, e2, ...)
3. Interact using refs: click, fill, type, select, check
4. Re-snapshot after navigation or DOM changes
5. close when done

playwright-cli open https://example.com/form
playwright-cli snapshot
playwright-cli fill e1 "user@example.com"
playwright-cli fill e2 "password123"
playwright-cli click e3
playwright-cli snapshot
playwright-cli close

Most-Used Commands

# Navigation
playwright-cli goto <url>
playwright-cli go-back / go-forward / reload

# Interaction
playwright-cli click e3
playwright-cli fill e5 "text"         # Clear and type
playwright-cli type "text"            # Type at current focus
playwright-cli press Enter
playwright-cli select e9 "option-value"
playwright-cli check e12 / uncheck e12

# Snapshot & capture
playwright-cli snapshot
playwright-cli snapshot --filename=after-click.yaml
playwright-cli screenshot
playwright-cli screenshot --filename=page.png
playwright-cli pdf --filename=page.pdf

# Auth state
playwright-cli state-save auth.json
playwright-cli state-load auth.json

Full command listing: references/command-reference.md

Snapshots

After each command, playwright-cli writes a snapshot YAML of the current browser state. Use --filename= when the artifact is a workflow result; omit for auto-timestamped files.

.playwright-cli/page-2026-02-14T19-22-42-679Z.yml

Sessions

playwright-cli -s=mysession open example.com --persistent
playwright-cli -s=mysession click e6
playwright-cli -s=mysession close
playwright-cli list          # List all active sessions
playwright-cli close-all     # Close all browsers
playwright-cli kill-all      # Force kill stale processes

Named sessions run isolated contexts (separate cookies, storage, history). Full session patterns: references/session-management.md

Storage & Network

# Cookies / localStorage / sessionStorage
playwright-cli cookie-list / cookie-set / cookie-delete / cookie-clear
playwright-cli localstorage-get theme / localstorage-set theme dark

# Request mocking
playwright-cli route "**/*.jpg" --status=404
playwright-cli route "https://api.example.com/**" --body='{"mock": true}'
playwright-cli unroute

DevTools & Debugging

playwright-cli console             # View console output
playwright-cli network             # View network requests
playwright-cli tracing-start / tracing-stop
playwright-cli video-start / playwright-cli video-stop video.webm
playwright-cli run-code "async page => await page.context().grantPermissions(['geolocation'])"

Setup

Requires Playwright MCP server. Configure in .mcp.json:

{ "playwright": { "command": "npx", "args": ["@playwright/mcp@latest"] } }

Copy from .codex/mcp.json.example if not configured. If global binary unavailable: npx playwright-cli <command>

Gotchas

• Flaky selectors on SPAs: data-testid changes between renders → prefer role-based selectors (getByRole) over CSS selectors
• Auth state not persisting between tests: each test starts with fresh context → use state-save / state-load to persist auth cookies across runs

References